>> it's weights. >> yeah? >> that's how we work out. we got water bags. >> how much does it weigh? >> about 30 pounds. >> not very much. >> there it is. >> some of the challenges of working out in prison aren't only about the access to the equipment you have or don't have, but it's also the kind of restrictions you have. oftentimes these prisons go on lockdown and people are kept in their cells or housing units for long periods of time and not really allowed out. but they still always find a way to work out. >> this is about 55 or 60 pounds. >> and in a world where fist fights are all too real, many inmates incorporate shadow boxing into their workouts. but jamie, a former jujitsu instructor doing time at indiana